Expansion-bolt



C. B. VAN ANTWERPl EXPANSION BOLT.

lAPPLICATION FILED SEPT. 25, i915- Patented Aug. 8, 1916.

Wl/M, 'w15 To all whom t may concern.'

- 'oLAjnENGE B. vAN ANTWERP, or CHICAGO, ILLINOIS.

EXPANSION-BOLT.

Be it known that I,l CLARENCE B. VAN ANTWERP, a' citizenof the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois, haveI invented certain-new and useful Improvements in Expansion-Bolts, of which the following is a speciication.

lVIy present invention relates to improvements in expansion/bolts, and hasv special reference, to the provision of such a bolt which fis of economical manufacture, and

' improved eiiciency. As is well known, the

purpose of such bolts is particularly for securing anything to concrete, brick, Stone, marble, tile, granite or any substance which is brittle" and will not take a thread or into maximum frictional area.

which` a screw cannotV conveniently `bedriven. Expansmn bolts, however, may be v advantageously used withany material when a particularly strong and dependable v attachment is desired.

I- have sought particularly to design my present bolt so that the expanding jacket or sleeve may be made most economically, and so that its expansion will develop a I have also sought to prevent any circumferential expansion'or any distortion in any manner, of the upper or outer end of the expanding sleeve so that there will be no force exerted tending to break out the edges ofthe hole into which the bolt is inserted. My bolt is so designed that it may bev assembled at the factory and sold, andjnstalled without taking it to pieces, and I have provided an imving proved rdust' and foreign matter from the threaded portions thereof.

I attain the above object by means of the structure illustrated in the accompanying ,Figure 1 1s a section through an installation of one of my bolts, showing the bolt, however, in 4full lines. Fig. 2 is a view similar to Fig. 1, showing `my expansion I .-loolt in section, the bolt not yet having been expanded. Fig. 3 isa view similar toFig.

expanded. Figs. 4 and 2, showing the bolt a blank from which the 5 are, respectively,

- expanding sleeve is. formed and the same and economical manner for exclud panding sleeve, 7, the outer surface of the inner end, 8, or the end which goes deepest into the hole, of which is preferably cylindrical, so that when it is expanded it will have a maximum of frictional, contact with the surrounding `walls of the hole. The inner surface, 9, opposite to the cylindrical portion, 8, 'is reduced or tapered inwardly to secure a parallelexpansion of the outer cylindrical portion. Above the taper, the

- Patented Aug. 8, 1916.

Application led September 25, 1915. Serial 11o. 52,541.

inner surface is aring at 10, but opposite y this inner portion, 10, the outer part, 11, of the sleeve is reduced so that it will have a thinner sectional dimension and iny con nection with the longitudinal slotting, 12, will permit of the free expansion of the cylindrical portion. The slots, 12, are carried well up into the' reduced portion, 11, but not to the top of the sleeve. The sleeve thus designed may economically be rolled from suitable metal so as to impart to -it the sectional characteristics above described.

I It may be either rolled in a long strip, and

then be blanked out, as shown in Fig. 4, or it may be blanked out and thenrolled. It is then cut or provided with the slots, 12, and the mortise, 13, and tenon, 14., as clearly shown in Fig. 5, which when the blank is rolled or formed into a cylinder, engage each other and. prevent any circumferential expansion of the top or lateral displacement ofthe meeting edges or any distortion of any kind at the upper or outer end of the expanding sleeve.

`The lower or inner edge, pending sleeve may4 preferably a thin web which may be turned over to retain the expanding element, as shown in Fig. 2. This expanding elementmay either 10a of the exbe rolled to bea bolt witha taper head, 20, as shown e in Fig. 2, or a taper nut. But in the event a taper nut is employed, and this construction has advantages under certain conditions, I prefer to make the nut in two semiconical sections, one -of which, 15, is provided with projecting dowel pins, 16, which enter registering dowel holes, 16a, in the complementary section.

The bottom of each section is provided with a thin web or diaphragm, 19, as clearly shown'in Fig. 6, "which servestoF keep 'foreign matter out of the structure, but which easily breaks out when the end of the bolt, 17, is screwed against it. The sections, 15, may also be providedwith the laterally extending spurs, 18, which will engage the expansion slots, 12, so as to prevent any tendency to turn,- which'the expanding cone may develop. v

Having described my invention, what I claimas new and desire to secure by Letters Patent is 1. An' expansion bolt comprising an expansible sleeve consistingof a blank of suit- .able metal rolled with an outer substantially cylindrical 'section having an inner v tapered surface, a portion of reduced section adjacent said cylindrical portion, longitudinal slots extending outwardly, from the inner end of said sleeve through said cylintending outwardly from the inner end thereof andmeans for expanding a portion of said sleeve comprising a bolt and a taperednt engaged thereby'one end lof the bore of "said nut being provided-with -a transversely disposed destructible web.

3. An expansion bolt comprising van expansible sleeve having longitudinal slots extending Voutwardly from the inner end thereof and means for expanding a portion of said sleeve comprising a bolt and a two piece tapered nut engaged thereby, each of the pieces of said nut being provided with a transversely. disposed destructible web across the bore thereof.

4.. An expanding bolt comprising an expan'sible shleld, means for expanding the inner end thereof,- said means comprising a nutl provided with a destructi'ble web across the bore thereof, and means for moving said nut and destroying said web.

Signed at Chicago, county of Cook and State of Illinois, this 21st day of September, l

CLARENCE B. VAN ANTWERP. Witnessesu. f l

' WM. CARROLLEICBELMAN,

BENJ. T. RooDHoUsn. 

